html {
  #app {
    width: 300px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 24px;

    .ipt-box {
      display: flex;
      align-items: center;

      input {
        width: 100px;
        border: 1px solid #ccc;
      }

      span {
        margin: 0 4px;
      }
    }

    button {
      width: 50px;
      margin-top: 12px;
    }
  }
}
